ARRL Logbook of the WorldA repository of log records submitted by users from
around the world; when both participants in a QSO submit matching QSO records to LoTW,
the QSO can be used for ARRL award credit

Grid Square LocaterBy F6FVY. Google Map based worldwide grid square
locator; just plug a grid square into the search box at the bottom of the page
and up pops a Google map of the region showing the borders of that grid square.
Or click on map location and grid square information for that point pops up.
Very nice!

PSK ReporterBy N1DQ. Google-map implementation of the PSK Reporter
data; see what PSK31 signals are being heard by monitor stations in your area;
call CQ in PSK31 and see which monitoring stations hear you; many other uses;
dynamite application

The Art and Skill of Radio-Telegraphy by N0HFF
An in-depth manual for learning, using, mastering and
enjoying the international morse code as a means of communication.
3rd edition, provided in Adobe Acrobat and MS Word formats